diff options
| author | Alan <alan@lxorguk.ukuu.org.uk> | 2007-05-08 03:24:21 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-08 14:14:59 -0400 |
| commit | 6309ed7cb2b0671b0db9386abc6307ec3108bbaa (patch) | |
| tree | b310c894dc328348b82b6fce109a686ff55abe2c /Documentation | |
| parent | 3972b7f67bf1a352a4a4c350b2245d759a41ea06 (diff) | |
tty: Clarify documentation of ->write()
The tty driver write method is different to the usual fops device write
methods as the buffer is already in kernel space. Clarify the docs since
someone writing a driver made that mistake.
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/tty.txt | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/tty.txt b/Documentation/tty.txt index 5f799e612e03..048a8762cfb5 100644 --- a/Documentation/tty.txt +++ b/Documentation/tty.txt | |||
| @@ -108,7 +108,9 @@ hardware driver through the function pointers within the tty->driver | |||
| 108 | structure: | 108 | structure: |
| 109 | 109 | ||
| 110 | write() Write a block of characters to the tty device. | 110 | write() Write a block of characters to the tty device. |
| 111 | Returns the number of characters accepted. | 111 | Returns the number of characters accepted. The |
| 112 | character buffer passed to this method is already | ||
| 113 | in kernel space. | ||
| 112 | 114 | ||
| 113 | put_char() Queues a character for writing to the tty device. | 115 | put_char() Queues a character for writing to the tty device. |
| 114 | If there is no room in the queue, the character is | 116 | If there is no room in the queue, the character is |